This information can be found on the ICAO Document:
Guidance on the Issuance of SNOWTAM
3. GENERAL PROVISIONS OF SNOWTAM
3.2. As of 5 November 2020, the maximum validity of SNOWTAM is 8 hours.
Note 2 – If there is a valid SNOWTAM in the old format (with 24 hours validity) issued on 4 November 2020, it is recommended to issue a new SNOWTAM with the new format, right after 0000 UTC to replace the old format SNOWTAM.
Note: When CAAs are using older databases, it is possible that the option "8 hours" is not available. In such case, you should select the older value of 24 hours validity and leave a comment.
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This question has appeared on the real examination, you can find the related countries below.
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Spain3
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Cyprus1
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Liechtenstein1
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United Kingdom1